Russell King wrote:
> The specs I have say the following about WRITE_BL_PARTIAL:
>
> Samsung (csd v1.2 mmc v4.1):
> 0: means that only the WRITE_BL_LEN block size can be used for block oriented data write.
> 1: means that smaller blocks can be used as well. The minimum block size is one byte.
>
> Sandisk (csd v1.1 mmc v1.4):
> 0: means that only the WRITE_BL_LEN block size can be used for block oriented data write.
> 1: means that smaller blocks can be used as well. The minimum block size is one byte.
>
> The wording is identical from these two differing manufacturers, so I
> suspect it comes from the original spec.
>
>
A sponsored copy of the official spec. is long overdue...
> I am not aware of any bug reports in this area, so I can't comment. In
> fact, I see very few reports of MMC problems at all, so I just assume
> that it merely works. Unless folk report bugs to me...
>
For some reason, I get lots. :)
It's probably because I am the maintainer for the only two drivers for
hardware that is found in laptops. More average Joes in that market.
Like you, I unfortunately haven't got any of these cards for myself. But
I've gotten reports of both that "other" readers use 512 bytes[1],
regardless of WRITE_BL_LEN, and that cards that have WRITE_BL_LEN of
1024 and _not_ partial, still work just fine with 512 bytes[2].
[1] http://list.hades.drzeus.cx/pipermail/wbsd-devel/2006-May/000485.html
[2] http://list.drzeus.cx/pipermail/sdhci-devel/2006-May/000826.html
> I don't know what to do about this since I don't have any cards and
> I've not seen any bug reports to investigate what's going on. So I'm
> just going to say "the code as it stands is correct as to my best
> knowledge, please provide details of it's failings."
>
>
I'll point people to your patch then and ask them to have you as a cc.
Rgds
Pierre
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
